rgw: improve support for Swift's object versioning.

rgw: improve support for Swift's object versioning.

This patch allows RadosGW to pass the RefStack with an accuracy
to the RFC7230 violation issue which is clearly a Tempest bug.

Fixes: http://tracker.ceph.com/issues/15925
Signed-off-by: Radoslaw Zarzynski <rzarzynski@mirantis.com>
(cherry picked from commit 237ad1210f5a6e4f191293ce532ca15869612a93)

Conflicts:
	src/rgw/rgw_op.cc
          In contrast to master, Jewel doesn't support
          container quota of Swift API. All tracks of this
          feature have been eradicated from the patch.
	src/rgw/rgw_rest_swift.cc
          Jewel doesn't include boost/optional.hpp but has
          boost/utility/in_place_factory.hpp. The conflict
          has been resolved to pull in both headers.